Question

cuanto es -(-7/10+3/5-(-4/15)?
cuanto es 5/18-1/4-(-5/12)+(-4/9)?

Answer 1

$- ( - \frac{7}{10} + \frac{3}{5} - ( - \frac{4}{15} )) = - ( - \frac{21}{30} + \frac{18}{30} - ( - \frac{8}{30} )) = - ( - \frac{21}{30} + \frac{26}{30} ) = - \frac{5}{30} = - \frac{1}{6}$